Operation method in v2x device mounted on vehicle

ABSTRACT

One disclosure of the present specification provides an operation method in a vehicle-to-everything (V2X) device mounted on a vehicle. The method comprises the steps of: receiving a capability enquiry message from a base station; and transmitting capability information to the base station. The capability information includes information on whether a wireless link with the base station and a sidelink with a neighboring V2X device are supported through the same antenna. The method comprises a step of receiving, from the base station, information about a default beam set on the basis of the capability information.

TECHNICAL FIELD

The present specification relates to mobile communications.

BACKGROUND

With the success of long term evolution (LTE)/LTE-Advanced (LTE-A) forthe fourth-generation mobile communication, the next generation mobilecommunication, which is the fifth-generation (so called 5G) mobilecommunication, has been attracting attentions and more and moreresearches are being conducted.

For the 5G mobile communication, new radio access technology (new RAT orNR) has been researched.

The fifth-generation communication defined by the internationaltelecommunication union (ITU) refers to providing a maximum datatransmission speed of 20 Gbps and a maximum transmission speed of 100Mbps per user in anywhere. It is officially called “IMT-2020” and aimsto be released around the world in 2020.

Meanwhile, LTE/LTE-A technology and NR technology may also be used forvehicle communication. This is called vehicle-to-everything (V2X).Communication technology through all interfaces with the vehicle iscommonly called V2X.

Communication between V2X devices without going through a base stationis called V2X communication, and a link used for communication betweenV2X devices is also called a sidelink.

3GPP Standard Release 16 discusses the implementation of NR V2X in theFR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz) bands. FR2frequency band is mmWave, and beam forming is absolutely required forstable communication. However, in the current 3GPP standard release 16,beam management is not considered for the sidelink in the FR2 band. Forthis reason, the arrival distance of the actual vehicle-to-vehiclesidelink (SideLink) communication cannot be guaranteed, and thus stablecommunication becomes impossible.

SUMMARY

Therefore, the disclosure of the present specification is to proposemethod for solving the above-mentioned problems.

One disclosure of the present specification provides A method ofoperating for V2X (VEHICLE-TO-EVERYTHING) device equipped on a vehicle.The method comprises: receiving capability Enquiry message from basestation; transmitting capability information to the base station;wherein the capability information includes information on whether theV2X device supports radio link with the base station and sidelink withneighbor V2X device by the same antenna, receiving, from the basestation, information on default beam which is configured based on thecapability information.

One disclosure of the present specification may provide a V2X(VEHICLE-TO-EVERYTHING) device equipped on a vehicle. The V2X devicecomprises at least one processor; and at least one memory for storinginstructions and operably electrically connectable with the at least oneprocessor, based on the instructions being operated by the at least oneprocessor, performed operation comprising: receiving capability Enquirymessage from base station; transmitting capability information to thebase station; wherein the capability information includes information onwhether the V2X device supports radio link with the base station andsidelink with neighbor V2X device by the same antenna, receiving, fromthe base station, information on default beam which is configured basedon the capability information.

One disclosure of the present specification provides a non-volatilecomputer-readable storage medium having recorded instructions. Theinstructions, based on being executed by one or more processors, causethe one or more processors to: receive capability Enquiry message frombase station; transmit capability information to the base station;wherein the capability information includes information on whether theV2X device supports radio link with the base station and sidelink withneighbor V2X device by the same antenna, receive, from the base station,information on default beam which is configured based on the capabilityinformation.

Therefore, the disclosure of the present specification is to proposemethod for solving the above-mentioned problems.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a wireless communication system.

FIG. 2 shows the structure of a radio frame according to FDD in 3GPPLTE.

FIGS. 3a to 3c are exemplary diagrams illustrating an exemplaryarchitecture for a service of next-generation mobile communication.

FIG. 4 illustrates structure of a radio frame used in NR.

FIG. 5 shows an example of subframe types in NR.

FIG. 6 is an exemplary diagram illustrating the concept of V2X.

FIG. 7 is an exemplary diagram illustrating a pair of transmit power andreceive sensitivity.

FIG. 8 shows an example of a situation in which beamforming is used forNR V2X sidelink in the FR2 band, but beam management is not used.

FIG. 9 shows vertical and horizontal angles of sidelink beams.

FIG. 10 shows REFSENS of the receiving vehicle at a beam angle of −90degrees, and

EIRP of the transmitting vehicle at a beam angle of 90 degrees.

FIG. 11 shows an example of setting a sidelink beam as a default beambased on capability information.

FIG. 12 shows an apparatus according to an embodiment.

FIG. 13 is a block diagram illustrating the configuration of a terminalaccording to an embodiment.

FIG. 14 shows a block diagram of a processor in which the disclosure ofthe present specification is implemented.

FIG. 15 is a detailed block diagram illustrating the transceiver of thefirst device shown in FIG. 12 or the transceiver of the device shown inFIG. 13 in detail.

FIG. 16 illustrates a communication system 1 applied to the disclosureof the present specification.

DETAILED DESCRIPTION

The technical terms used herein are used to merely describe specificembodiments and should not be construed as limiting the presentspecification. Further, the technical terms used herein should be,unless defined otherwise, interpreted as having meanings generallyunderstood by those skilled in the art but not too broadly or toonarrowly. Further, the technical terms used herein, which are determinednot to exactly represent the spirit of the specification, should bereplaced by or understood by such technical terms as being able to beexactly understood by those skilled in the art. Further, the generalterms used herein should be interpreted in the context as defined in thedictionary, but not in an excessively narrowed manner.

The expression of the singular number in the present specificationincludes the meaning of the plural number unless the meaning of thesingular number is definitely different from that of the plural numberin the context. In the following description, the term ‘include’ or‘have’ may represent the existence of a feature, a number, a step, anoperation, a component, a part or the combination thereof described inthe present specification, and may not exclude the existence or additionof another feature, another number, another step, another operation,another component, another part or the combination thereof.

The terms ‘first’ and ‘second’ are used for the purpose of explanationabout various components, and the components are not limited to theterms ‘first’ and ‘second’. The terms ‘first’ and ‘second’ are only usedto distinguish one component from another component. For example, afirst component may be named as a second component without deviatingfrom the scope of the present specification.

It will be understood that when an element or layer is referred to asbeing “connected to” or “coupled to” another element or layer, it can bedirectly connected or coupled to the other element or layer orintervening elements or layers may be present. In contrast, when anelement is referred to as being “directly connected to” or “directlycoupled to” another element or layer, there are no intervening elementsor layers present.

Hereinafter, exemplary embodiments of the present specification will bedescribed in greater detail with reference to the accompanying drawings.In describing the present specification, for ease of understanding, thesame reference numerals are used to denote the same componentsthroughout the drawings, and repetitive description on the samecomponents will be omitted. Detailed description on well-known artswhich are determined to make the gist of the specification unclear willbe omitted. The accompanying drawings are provided to merely make thespirit of the specification readily understood, but not should beintended to be limiting of the specification. It should be understoodthat the spirit of the specification may be expanded to itsmodifications, replacements or equivalents in addition to what is shownin the drawings.

In the present disclosure, “A or B” may mean “only A”, “only B”, or“both A and B”. In other words, “A or B” in the present disclosure maybe interpreted as “A and/or B”. For example, “A, B or C” in the presentdisclosure may mean “only A”, “only B”, “only C”, or “any combination ofA, B and C”.

In the present disclosure, slash (/) or comma (,) may mean “and/or”. Forexample, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean “onlyA”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, Bor C”.

In the present disclosure, “at least one of A and B” may mean “only A”,“only B” or “both A and B”. In addition, the expression “at least one ofA or B” or “at least one of A and/or B” in the present disclosure may beinterpreted as same as “at least one of A and B”.

In addition, in the present disclosure, “at least one of A, B and C” maymean “only A”, “only B”, “only C”, or “any combination of A, B and C”.In addition, “at least one of A, B or C” or “at least one of A, B and/orC” may mean “at least one of A, B and C”.

Also, parentheses used in the present disclosure may mean “for example”.In detail, when it is shown as “control information (PDCCH)”, “PDCCH”may be proposed as an example of “control information”. In other words,“control information” in the present disclosure is not limited to“PDCCH”, and “PDDCH” may be proposed as an example of “controlinformation”. In addition, even when shown as “control information(i.e., PDCCH)”, “PDCCH” may be proposed as an example of “controlinformation”.

Technical features that are individually described in one drawing inthis specification may be implemented individually or simultaneously.

In the appended drawings, although a User Equipment (UE) is illustratedas an example, this is merely an example given to simplify thedescription of the present disclosure. Herein, a UE may mean to awireless communication device performing communication in acommunication system, such as EPS and/or 5GS, and so on. And, the UEshown in the drawing may also be referred to as a terminal, a mobileequipment (ME), a wireless communication device, a wirelesscommunication apparatus, and so on. Additionally, the UE may be aportable device, such as a laptop computer, a mobile phone, a PDA, asmart phone, a multimedia device, and so on, or the UE may be anon-portable device, such as a personal computer (PC) or a vehiclemounted device.

Hereinafter, the UE is used as an example of a device capable ofwireless communication (e.g., a wireless communication device, awireless device, or a wireless device). The operation performed by theUE may be performed by any device capable of wireless communication. Adevice capable of wireless communication may also be referred to as awireless communication device, a wireless device, or a wireless device.

A base station, a term used below, generally refers to a fixed stationthat communicates with a wireless device, which may be called otherterms such as an evolved-NodeB (eNodeB), an evolved-NodeB (eNB), a BTS(Base Transceiver System), an access point (Access Point), gNB (Nextgeneration NodeB).

FIG. 1 is a wireless communication system.

As can be seen with reference to FIG. 1, a wireless communication systemincludes at least one base station (BS). The BS is divided into a gNodeB(or gNB) 20 a and an eNodeB (or eNB) 20 b. The gNB 20 a supports 5Gmobile communication. The eNB 20 b supports 4G mobile communication,that is, long term evolution (LTE).

Each base station 20 a and 20 b provides a communication service for aspecific geographic area (commonly referred to as a cell) (20-1, 20-2,20-3). A cell may in turn be divided into a plurality of regions(referred to as sectors).

A UE typically belongs to one cell, and the cell to which the UE belongsis called a serving cell. A base station providing a communicationservice to a serving cell is referred to as a serving base station(serving BS). Since the wireless communication system is a cellularsystem, other cells adjacent to the serving cell exist. The other celladjacent to the serving cell is referred to as a neighbor cell. A basestation that provides a communication service to a neighboring cell isreferred to as a neighbor BS. The serving cell and the neighboring cellare relatively determined based on the UE.

Hereinafter, downlink means communication from the base station (20) tothe UE (10), and uplink means communication from the UE (10) to the basestation (20). In the downlink, the transmitter may be a part of the basestation (20), and the receiver may be a part of the UE (10). In theuplink, the transmitter may be a part of the UE (10), and the receivermay be a part of the base station (20).

Meanwhile, a wireless communication system may be largely divided into afrequency division duplex (FDD) scheme and a time division duplex (TDD)scheme. According to the FDD scheme, uplink transmission and downlinktransmission are performed while occupying different frequency bands.According to the TDD scheme, uplink transmission and downlinktransmission are performed at different times while occupying the samefrequency band. The channel response of the TDD scheme is substantiallyreciprocal. This means that the downlink channel response and the uplinkchannel response are almost the same in a given frequency domain.Accordingly, in the TDD-based wireless communication system, there is anadvantage that the downlink channel response can be obtained from theuplink channel response. In the TDD scheme, since uplink transmissionand downlink transmission are time-divided in the entire frequency band,downlink transmission by the base station and uplink transmission by theUE cannot be simultaneously performed. In a TDD system in which uplinktransmission and downlink transmission are divided in subframe units,uplink transmission and downlink transmission are performed in differentsubframes.

Hereinafter, the LTE system will be described in more detail.

FIG. 2 shows the structure of a radio frame according to FDD in 3GPPLTE.

Referring to FIG. 2, a radio frame includes 10 subframes, and onesubframe includes two slots. The slots in the radio frame are numberedfrom 0 to 19. The time it takes for one subframe to be transmitted isreferred to as a transmission time interval (TTI). The TTI may bereferred to as a scheduling unit for data transmission. For example, thelength of one radio frame may be 10 ms, the length of one subframe maybe 1 ms, and the length of one slot may be 0.5 ms.

The structure of the radio frame is merely an example, and the number ofsubframes included in the radio frame or the number of slots included inthe subframe may be variously changed.

Meanwhile, one slot may include a plurality of orthogonal frequencydivision multiplexing (OFDM) symbols. How many OFDM symbols are includedin one slot may vary according to a cyclic prefix (CP).

One slot includes NRB resource blocks (RBs) in a frequency domain. Forexample, in the LTE system, the number of resource blocks (RBs), thatis, NRB may be any one of 6 to 110.

A resource block (RB) is a resource allocation unit and includes aplurality of subcarriers in one slot. For example, if one slot includes7 OFDM symbols in the time domain and the resource block includes 12subcarriers in the frequency domain, one resource block may include 7*12resource elements (REs).

In 3GPP LTE, physical channels are divided into data channels, such asPDSCH (Physical Downlink Shared Channel) and PUSCH (Physical UplinkShared Channel), and control channels, such as PDCCH (Physical DownlinkControl Channel), PCFICH (Physical Control Format Indicator Channel),PHICH (Physical Hybrid-ARQ Indicator Channel) and PUCCH (Physical UplinkControl Channel).

The uplink channel includes PUSCH, PUCCH, SRS(Sounding ReferenceSignal), and PRACH (Physical Random Access Channel).

<Next-Generation Mobile Communication Network>

Thanks to the success of LTE (long term evolution)/LTE-Advanced (LTE-A)for 4th generation mobile communication, interest in next-generation,that is, 5th generation (so-called 5G) mobile communication isincreasing, and research is being conducted one after another.

5G mobile communication, defined by the International TelecommunicationUnion (ITU), refers to providing a data transmission rate of up to 20Gbps and a perceived transmission speed of at least 100 Mbps anywhere.The official name is ‘IMT-2020’, and it aims to commercialize itworldwide in 2020.

The ITU proposes three usage scenarios, for example, eMBB (enhancedMobile BroadBand), mMTC (massive Machine Type Communication) and URLLC(Ultra Reliable and Low Latency Communications).

URLLC relates to usage scenarios that require high reliability and lowlatency. For example, services such as autonomous driving, factoryautomation, and augmented reality require high reliability and lowlatency (eg, latency of 1 ms or less). Currently, the delay time of 4G(LTE) is statistically 21-43 ms (best 10%) and 33-75 ms (median). Thisis insufficient to support services requiring latency of less than 1 ms.Next, the eMBB usage scenario relates to a usage scenario requiringmobile ultra-wideband.

That is, the 5th generation mobile communication system may targethigher capacity than the current 4G LTE, increase the density of mobilebroadband users, and support D2D (Device to Device), high stability, andMTC (Machine type communication). 5G R&D also aims to achieve lowerlatency and lower battery consumption than 4G mobile communicationsystems to better realize the Internet of Things. For such 5G mobilecommunication, a new radio access technology (New RAT or NR) may beproposed.

The NR frequency band may be defined as two types of frequency range,i.e., FR1 and FR2. The numerical value of the frequency range may bechanged. For example, the frequency ranges of the two types (FR1 andFR2) may be as shown in Table 1 below. For ease of explanation, in thefrequency ranges used in the NR system, FR1 may mean “sub 6 GHz range”,FR2 may mean “above 6 GHz range,” and may be referred to as millimeterwave (mmW).

TABLE 1 Frequency Range Corresponding designation frequency rangeSubcarrier Spacing FR1 450 MHz-6000 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

As mentioned above, the numerical value of the frequency range of the NRsystem may be changed. For example, FR1 may include a frequency band of410 MHz to 7125 MHz as shown in Table 2 below. That is, FR1 may includea frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or more. Forexample, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) ormore included in FR1 may include an unlicensed band. Unlicensed bandsmay be used for a variety of purposes, for example for communication forvehicles (e.g., autonomous driving).

TABLE 2 Frequency Range Corresponding designation frequency rangeSubcarrier Spacing FR1 410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz

<Operation Bands in NR>

The operating bands in NR are as follows.

The operating band of Table 3 below is an operating band converted fromthe operating band of LTE/LTE-A. This is called the FR1 band.

TABLE 3 NR operation Uplink operation bands Downlink operation bandsDuplex bands F_(UL)_low-F_(UL)_high F_(DL)_low-F_(DL)_high mode n1 1920MHz-1980 MHz 2110 MHz-2170 MHz FDD n2 1850 MHz-1910 MHz 1930 MHz-1990MHz FDD n3 1710 MHz-1785 MHz 1805 MHz-1880 MHz FDD n5 824 MHz-849 MHz869 MHz-894 MHz FDD n7 2500 MHz-2570 MHz 2620 MHz-2690 MHz FDD n8 880MHz-915 MHz 925 MHz-960 MHz FDD n20 832 MHz-862 MHz 791 MHz-821 MHz FDDn28 703 MHz-748 MHz 758 MHz-803 MHz FDD n38 2570 MHz-2620 MHz 2570MHz-2620 MHz TDD n41 2496 MHz-2690 MHz 2496 MHz-2690 MHz TDD n50 1432MHz-1517 MHz 1432 MHz-1517 MHz TDD n51 1427 MHz-1432 MHz 1427 MHz-1432MHz TDD n66 1710 MHz-1780 MHz 2110 MHz-2200 MHz FDD n70 1695 MHz-1710MHz 1995 MHz-2020 MHz FDD n71 663 MHz-698 MHz 617 MHz-652 MHz FDD n741427 MHz-1470 MHz 1475 MHz-1518 MHz FDD n75 N/A 1432 MHz-1517 MHz SDLn76 N/A 1427 MHz-1432 MHz SDL n77 3300 MHz-4200 MHz 3300 MHz-4200 MHzTDD n78 3300 MHz-3800 MHz 3300 MHz-3800 MHz TDD n79 4400 MHz-5000 MHz4400 MHz-5000 MHz TDD n80 1710 MHz-1785 MHz N/A SUL n81 880 MHz-915 MHzN/A SUL n82 832 MHz-862 MHz N/A SUL n83 703 MHz-748 MHz N/A SUL n84 1920MHz-1980 MHz N/A SUL

The table below shows the NR operating bands defined on the highfrequency phase. This is called the FR2 band.

TABLE 4 NR operation Uplink operation bands Downlink operation bandsDuplex bands F_(UL)_low-F_(UL)_high F_(DL)_low-F_(DL)_high mode n25726500 MHz-29500 MHz 26500 MHz-29500 MHz TDD n258 24250 MHz-27500 MHz24250 MHz-27500 MHz TDD n259 37000 MHz-40000 MHz 37000 MHz-40000 MHz TDDn260 37000 MHz-40000 MHz 37000 MHz-40000 MHz FDD n261 27500 MHz-28350MHz 27500 MHz-28350 MHz FDD

FIGS. 3a to 3c are exemplary diagrams illustrating an exemplaryarchitecture for a service of next-generation mobile communication.

Referring to FIG. 3a , the UE is connected to the LTE/LTE-A-based celland the NR-based cell in a DC (dual connectivity) manner.

The NR-based cell is connected to a core network for the existing 4Gmobile communication, that is, the NR-based cell is connected an EvolvedPacket Core (EPC).

Referring to FIG. 3b , unlike FIG. 3a , an LTE/LTE-A-based cell isconnected to a core network for 5G mobile communication, that is, theLTE/LTE-A-based cell is connected to a Next Generation (NG) corenetwork.

A service method based on the architecture shown in FIG. 3a and FIG. 3bis referred to as NSA (non-standalone).

Referring to FIG. 3c , UE is connected only to an NR-based cell. Aservice method based on this architecture is called SA (standalone).

Meanwhile, in the NR, it may be considered that reception from a basestation uses downlink subframe, and transmission to a base station usesuplink subframe. This method can be applied to paired and unpairedspectra. A pair of spectrum means that two carrier spectrums areincluded for downlink and uplink operation. For example, in a pair ofspectrums, one carrier may include a downlink band and an uplink bandthat are paired with each other.

FIG. 4 illustrates structure of a radio frame used in NR.

In NR, uplink and downlink transmission consists of frames. A radioframe has a length of 10 ms and is defined as two 5 ms half-frames(Half-Frame, HF). A half-frame is defined as 5 1 ms subframes (Subframe,SF). A subframe is divided into one or more slots, and the number ofslots in a subframe depends on SCS (Subcarrier Spacing). Each slotincludes 12 or 14 OFDM(A) symbols according to CP (cyclic prefix). WhenCP is usually used, each slot includes 14 symbols. When the extended CPis used, each slot includes 12 symbols. Here, the symbol may include anOFDM symbol (or a CP-OFDM symbol) and an SC-FDMA symbol (or a DFT-s-OFDMsymbol).

FIG. 5 shows an example of subframe types in NR.

The TTI (transmission time interval) shown in FIG. 5 may be referred toas a subframe or a slot for NR (or new RAT). The subframe (or slot) ofFIG. 5 may be used in a TDD system of NR (or new RAT) to minimize datatransmission delay. As shown in FIG. 5, a subframe (or slot) includes 14symbols, like the current subframe. The front symbol of the subframe (orslot) may be used for the DL control channel, and the rear symbol of thesubframe (or slot) may be used for the UL control channel. The remainingsymbols may be used for DL data transmission or UL data transmission.According to this subframe (or slot) structure, downlink transmissionand uplink transmission may be sequentially performed in one subframe(or slot). Accordingly, downlink data may be received within a subframe(or slot), and uplink acknowledgment (ACK/NACK) may be transmittedwithin the subframe (or slot).

The structure of such a subframe (or slot) may be referred to as aself-contained subframe (or slot).

Specifically, the first N symbols in a slot may be used to transmit DLcontrol channel (hereinafter, DL control region), and the last M symbolsin a slot may be used to transmit UL control channel (hereinafter, ULcontrol region). N and M are each an integer greater than or equal to 0.A resource region (hereinafter, referred to as a data region) betweenthe DL control region and the UL control region may be used for DL datatransmission or UL data transmission. For example, the PDCCH may betransmitted in the DL control region and the PDSCH may be transmitted inthe DL data region. The PUCCH may be transmitted in the UL controlregion, and the PUSCH may be transmitted in the UL data region.

When the structure of such subframe (or slot) is used, the time it takesto retransmit data in which a reception error occurs is reduced, so thatthe final data transmission latency can be minimized. In such aself-contained subframe (or slot) structure, a time gap, from thetransmission mode to the reception mode or from the reception mode tothe transmission mode, may be required in a transition process. To this,some OFDM symbols when switching from DL to UL in the subframe structuremay be set as a guard period (GP).

<Support of Various Numerologies>

In the next generation system, with development of wirelesscommunication technologies, a plurality of numerologies may be providedto a UE.

The numerologies may be defined by a length of cycle prefix (CP) and asubcarrier spacing. One cell may provide a plurality of numerology to aUE. When an index of a numerology is represented by μ, a subcarrierspacing and a corresponding CP length may be expressed as shown in thefollowing table.

TABLE 5 M Δf = 2^(μ) · 15 [kHz] CP 0 15 Normal 1 30 Normal 2 60 Normal,Extended 3 120 Normal 4 240 Normal

In the case of a normal CP, when an index of a numerology is expressedby μ, the number of OLDM symbols per slot Nslotsymb, the number of slotsper frame Nframe,μslot, and the number of slots per subframeNsubframe,μslot are expressed as shown in the following table.

TABLE 6 μ N^(slot) _(symb) N^(frame,μ) _(slot) N^(subframe,μ) _(slot) 014 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32

In the case of an extended CP, when an index of a numerology isrepresented by μ, the number of OLDM symbols per slot Nslotsymb, thenumber of slots per frame Nframe,μslot, and the number of slots persubframe Nsubframe,μslot are expressed as shown in the following table.

TABLE 7 M N^(slot) _(symb) N^(frame,μ) _(slot) N^(subframe,μ) _(slot) 212 40 4

<V2X (Vehicle-to-Everything)>

V2X (vehicle-to-everything) refers to communication technology throughall interfaces with the vehicle. The implementation form of V2X may beas follows.

In V2X, ‘X’ may mean a person (Persian) or a pedestrian (PEDESTRIAN). Inthis case, V2X may be displayed as V2P (vehicle-to-person orvehicle-to-pedestrian). Here, the pedestrian is not necessarily limitedto a person moving on foot, and may include a person riding a bicycle, adriver or a passenger of a vehicle (below a certain speed).

Alternatively, ‘X’ may be an infrastructure/network. In this case, V2Xmay be expressed as V2I (vehicle-to-infrastructure) or V2N(vehicle-to-network), and may mean communication between a vehicle and aroadside unit (ROADSIDE UNIT: RSU) or a vehicle and a network. Theroadside device may be a device that informs traffic-relatedinfrastructure, for example, a speed. The roadside device may beimplemented in a base station or a fixed terminal.

Alternatively, ‘X’ in V2X may be a vehicle (VEHICLE). In this case, V2Xmay be expressed as V2V (vehicle-to-vehicle), and may mean communicationbetween vehicles.

A wireless device mounted on a vehicle may be referred to as a V2Vdevice or a V2X device.

Communication between V2X devices without going through a base stationis called V2X communication, and a link used for communication betweenV2X devices is also called sidelink.

There are the followings as physical signals used in sidelink.

-   -   PSSCH (Physical Sidelink Shared Channel)    -   PSCCH (Physical Sidelink Control Channel)    -   PSDCH (Physical Sidelink Discovery Channel)    -   PSBCH (Physical Sidelink Broadcast Channel)

In addition, there are the following physical signals used in sidelink.

-   -   Demodulation Reference signal (DMRS)    -   Sidelink Synchronization signal (SLSS)

The SLSS includes a primary sidelink synchronization signal (PSLSS) anda secondary sidelink synchronization signal (Secondary SLSS: SSLSS).

FIG. 6 is an exemplary diagram illustrating the concept of V2X.

As can be seen with reference to FIG. 6, the wireless devices (ie, V2Xdevices) (100-1, 100-2, 100-3) mounted on the vehicle may communicatewith each other.

<Problems to be Solved by the Disclosure of this Specification>

3GPP Standard Release 16 discusses the implementation of NR V2X in theFR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz) bands. As FR2frequency band is mmWave, beam forming is absolutely required for stablecommunication. However, in the current 3GPP standard Release 16, beammanagement is not considered for the sidelink in the FR2 band. For thisreason, the actual vehicle-to-vehicle sidelink (SideLink) communicationreach distance cannot be guaranteed, and thus stable communicationbecomes impossible.

<Disclosures of the Present Specification>

Accordingly, the disclosure of the present specification suggestsmethods for solving the above-described problems. Specifically, thedisclosure of the present specification proposes a sidelink beamformingoperation method for NR V2X communication in the FR2 band (mmWave).

Based on the current FR2 28 GHz band Uu link (interface between the basestation and the terminal) related transmit power (eg, minimum peakeffective isotropic radiated power (EIRP), spherical coverage EIRP) andreception sensitivity (reference sensitivity, REF SENS), the sidelinkbudget (SideLink) Budget) (ie, communication arrival distance) may beknown through path loss (PL) analysis.

FIG. 7 is an exemplary diagram illustrating a pair of transmit power andreceive sensitivity.

Referring to FIG. 7, a pair of transmit power and receive sensitivityused in Equations 1 and 2 for path loss (PL) is shown. EIS stands forEffective Isotropic Sensitivity.

PL(dBm)=minimum peak EIRP−REFSENS  [Equation 1]

PL(dBm)=spherical coverage EIRP at CDF 60%_tile−EIS  [Equation 2]

The vehicle-to-vehicle sidelink communication coverage distance(d(meter)) can be obtained by applying the PL calculated above to a freespace path loss (FSPL) model.

FSPL(dBm)=20*log 10(d_meter)+20*log 10(fc_GHz)+32.45

FSPS=PL

d(meter)=power(10,(PL−20*log 10(fc_GHz)−92.45)/20)  [Equation 3]

The frequency bands of V2X devices (eg, terminals using Power Class2)operating in the FR2 band and the minimum peak EIRP, spherical coverageEIRP, REFSENSE, and EIS of each frequency band are summarized asfollows.

TABLE 8 Power class Terminal type 1 Fixed wireless access (FWA) UE 2Vehicular UE 3 Handheld UE 4 High power non-handheld UE

The table below shows the minimum peak EIRP for power class 2.

TABLE 9 Operating band Min peak EIRP (dBm) n257 29 n258 29 n261 29Minimum peak EIRP is defined as a lower limit with no tolerance.

The table below shows the spherical coverage for power class 2.

TABLE 10 Operating band minimum EIRP at 60%-tile CDF (dBm) n257 18.0n258 18.0 n261 18.0 In a 60%-tile cumulative distribution function(CDF), the Minimum EIRP is defined as a lower limit with no tolerance.

Using the above values, the communication distance between vehicles isanalyzed according to the presence or absence of beam forming and beammanagement as follows.

I. When Using Beamforming and Beam Management for NR V2X Sidelink in FR2Band

In this case, the sidelink communication reach distance may be analyzeddifferently depending on whether the used antenna is dedicated to thesidelink or shared with the Uu link (the link between the base stationand the V2X device).

In the case of a sidelink-only antenna, since a beam can be optimallyformed in the direction of the transmit/receive beam through thesidelink, the above PL Equation 1 can be applied.

In this case, as shown in Table 11 below, it can be seen thattransmission/reception is possible up to about 956 meters based on achannel bandwidth of 50 MHz and about 340 meters based on a channelbandwidth of 400 MHz. However, in the actual FR2 licensed band, it isexpected that there will be few cases in which sidelink-only service isprovided without Uu link NR service. Therefore, a model supporting bothUu link and side link should be considered.

When both the sidelink and the Uu link are supported by the commonantenna, since the sidelink must be supported in a situation thatsatisfies the spherical coverage EIRP of the Uu link standard, PLEquation 2, that is, using spherical coverage EIRP and EIS, is used. PLcan be applied. In this case, as shown in below Table 11, it can be seenthat transmission/reception is possible up to about 76 meters based on achannel bandwidth of 50 MHz and about 27 meters based on a channelbandwidth of 400 MHz. It is judged that this is close to the actualmodel.

TABLE 11 Using Beamforming and Beam Management EIS@60% REFSENS (dbm/CBW)(dBm/CBW) Min.PeakEIRP 50 100 200 400 EIRP@60% 50 100 200 400 (dBm) MHzMHz MHz MHz (dBM) MHz MHz MHz MHz 29 −92 −89 −86 −83 18 −81 −78 −75 −75PL 121 118 115 112 99 96 93 90 Distance 956 677 479 339 76 54 38 27 (m)

II. When Beamforming is Used for NR V2X Sidelink in FR2 Band, but BeamManagement is not Used

In this case, it cannot be guaranteed to properly form the sidelink inthe direction of the transmit/receive beam.

FIG. 8 shows an example of a situation in which beamforming is used forNR V2X sidelink in the FR2 band, but beam management is not used, andFIG. 9 shows vertical and horizontal angles of sidelink beams.

As shown in FIG. 8, when both the sidelink and the Uu link are supportedby the common antenna, as an operation without beam management, the FR2NR V2X operation is applied to the Uu link when switching from the Uulink to the sidelink. There may be a case where sidelink communicationis performed while maintaining the beam as it is. In this case, the beamformed on the sidelink corresponds to the SideLobe, the beam gainbecomes low, the EIRP actually applied becomes small, and the REFSENSand EIS become large, so that the PL decreases. As a result, the arrivaldistance(d) of the sidelink communication is reduced, and the quality ofthe sidelink communication is not guaranteed.

The main beam is formed at about −40 degrees for the left receivingvehicle and about 40 degrees for the right transmitting vehicle, and inthis state, −90 degrees (receiving vehicle) and 90 degrees (transmittingvehicle) corresponding to the side link The PL of the direction can becalculated as shown in Table 2 from the following equation.

PL (dBm)=EIRP_at_Sidelink−REFSENS_at_Sidelink  [Equation 4]

From here,

EIRP_at_Sidelink=minimum{EIRP_at_Vertical_90 degrees&Horizontal_−90degrees,Spherical coverage EIRP at CDF 60%}

REFSENS_at_Sidelink=maximum{RESENSE_at_Vertical_90eh&Horizontal_90degrees,EIS}

The assumed vertical and horizontal angles are shown in FIG. 9.

The table below shows the sidelink reach when beamforming is used butbeam management is not used.

TABLE 12 In case beamforming is used but beam management is not used (w/BF & w/o BM) REFSENS_at_Sidelink (dBm/CBW) EIRP_at_Sidelink 50 100 200400 (dBm) MHz MHz MHz MHz 6.6 −72.5 −69.5 −66.5 −63.5 PL 79.1 76.1 73.170.1 Distance(m) 8 5 4 3

Sidelink communication reach distance calculated from PL is very short,about 8 meters based on 50 MHz reception channel bandwidth and 3 metersbased on 400 MHz. And even if it is possible, the distance must be toolimited.

In order to solve this problem, in a situation where both the sidelinkand the Uu link are supported by the common antenna, if beam managementcannot be used, when switching from the Uu link to the sidelink in theFR2 band, the Uu link There may be a method of forming a beam by defaultas a sidelink to a level that satisfies the old coverage EIRP. Thismethod can ensure that EIRP and REFSENS are at the Uu link level to forma main lobe in the sidelink direction as much as possible.

FIG. 10 shows REFSENS of the receiving vehicle at a beam angle of −90degrees, and EIRP of the transmitting vehicle at a beam angle of 90degrees.

FIG. 10 shows path loss PL in the −90 degree (receiving vehicle) and 90degree (transmitting vehicle) directions corresponding to the sidelinkin a situation where beamforming is used but beam management is notused.

The path loss PL can be obtained as shown in Table 13 below.

The table below shows the sidelink arrival distance in a situation wherebeamforming is used but beam management is not used when forming adefault beam in the sidelink direction.

TABLE 13 In case beamforming is used but beam management is not used (w/BF & w/o BM) REFSENS_at_Sidelink (dBm/CBW) EIRP_at_Sidelink 50 100 200400 (dBm) MHz MHz MHz MHz 17.2 −81 −78 −75 −72 PL 98.2 95.2 92.2 89.2Distance(m) 69 49 35 25

The sidelink communication reach distance calculated from the PL isabout 69 meters based on the reception channel bandwidth of 50 MHz andabout 25 meters based on 400 MHz.

In summary, for this reason, a V2X device supporting FR2 NR supportsboth the Uu link and the sidelink with a common antenna, supports beammanagement for the Uu link, and supports beam management for thesidelink. If not supported, when switching from the Uu link to thesidelink, we propose a method of forming a beam with the sidelink as abasic beam to a level that satisfies the Uu link spherical coverageEIRP. Due to the characteristics of the FR2 beam, simultaneoustransmission or reception of the Uu link and the sidelink at the sametime is not supported, that is, it is suggested that the Uu link and thesidelink of the V2X device support the TDM (Time Division Mutiplexing)method.

To this end, it is proposed that the base station (gNB or eNodeB)provides information on the sidelink schedule and default beam angle tothe terminal.

In addition, the vehicle terminal needs to transmit capabilityinformation on whether or not the terminal supports both the Uu link andthe side link to the base station. This will be described with referenceto FIG. 11.

FIG. 11 shows an example of setting a sidelink beam as a default beambased on capability information.

First, the base station 200 transmits a capability inquiry message.Then, the V2X device 100 transmits the capability information to thebase station 200. The capability information may include informationindicating that the V2X device supports both the Uu link and thesidelink.

Then, the base station 200 may deliver information to the V2X device 100to set the sidelink schedule and the corresponding sidelink beam as a‘default beam’.

Here, that the V2X device supports both the Uu link and the sidelinkmeans that it supports communication with the base station and V2Xcommunication using the same antenna.

That is, when the V2X device supports both the Uu link and the sidelink,it means that both communication with the base station and V2Xcommunication are performed through the first RF chain (including theantenna) in the same frequency band (band).

In this case, information indicating whether the V2X device supportsboth the Uu link and the sidelink may be included in the capabilityinformation for each band.

Or in a different frequency band (band), communication with the basestation uses the first RF chain (without antenna), and V2X communicationuses the second RF chain (without antenna), but even when the sameantenna is shared, the same It may be included in supportingcommunication with a base station and V2X communication using anantenna.

In this case, information indicating whether the V2X device supportsboth the Uu link and the side link may be included in the capabilityinformation for each RF implementation.

And, not supporting both the Uu link and the sidelink means that onlyone of the communication with the base station or the V2X communicationis supported using the same antenna. That is, it refers to a terminalthat supports only one of communication with a base station or V2Xcommunication using the first RF chain (including antenna) in the samefrequency band (band).

The default beam may be defined at a level that satisfies the Uu linkspherical coverage EIRP, as shown in FIGS. 9 and 10.

For example, if the Uu link spherical coverage includes 90 degrees (or−90 degrees) with respect to the vertical axis, it is suggested as abeam of 90 degrees or −90 degrees with respect to the vertical axis tothe front or rear of the vehicle.

As another example, if the Uu link spherical coverage is less than 90degrees (or −90 degrees) with respect to the vertical axis, a beam thatis maximally closest to the 90 degrees or −90 degrees beam with respectto the vertical axis to the front or rear of the vehicle is suggested.

III. Summary of the Disclosures Herein

One disclosure of the present specification provides A method ofoperating for V2X (VEHICLE-TO-EVERYTHING) device equipped on a vehicle.The method comprises: receiving capability Enquiry message from basestation; transmitting capability information to the base station;wherein the capability information includes information on whether theV2X device supports radio link with the base station and sidelink withneighbor V2X device by the same antenna, receiving, from the basestation, information on default beam which is configured based on thecapability information.

The information on default beam includes information configuring a beamfor sidelink as default beam.

The information on default beam includes information for a beam forsidelink.

The default beam is determined by a level that satisfies a sphericalcoverage EIRP (effective isotropic radiated power) for a radio link withthe base station.

The default beam is set to a beam of 90 degrees or −90 degrees withrespect to the vertical axis to the front or rear Way, based on that thespherical coverage for the radio link with the base station includes 90degrees or −90 degrees with respect to the vertical axis of the vehicle.

The sidelink is operated in FR2 band.

Beamforming is used for the sidelink, but beam management for thesidelink is not used.

One disclosure of the present specification may provide a V2X(VEHICLE-TO-EVERYTHING) device equipped on a vehicle. The V2X devicecomprises at least one processor; and at least one memory for storinginstructions and operably electrically connectable with the at least oneprocessor, based on the instructions being operated by the at least oneprocessor, performed operation comprising: receiving capability Enquirymessage from base station; transmitting capability information to thebase station; wherein the capability information includes information onwhether the V2X device supports radio link with the base station andsidelink with neighbor V2X device by the same antenna, receiving, fromthe base station, information on default beam which is configured basedon the capability information.

One disclosure of the present specification provides a non-volatilecomputer-readable storage medium having recorded instructions. Theinstructions, based on being executed by one or more processors, causethe one or more processors to: receive capability Enquiry message frombase station; transmit capability information to the base station;wherein the capability information includes information on whether theV2X device supports radio link with the base station and sidelink withneighbor V2X device by the same antenna, receive, from the base station,information on default beam which is configured based on the capabilityinformation.

IV. Devices in General to which the Disclosure of the PresentSpecification May be Applied

The disclosures of the present specification described so far may beimplemented through various means. For example, the disclosures of thepresent specification may be implemented by hardware, firmware,software, or a combination thereof. Specifically, it will be describedwith reference to the drawings.

FIG. 12 shows an apparatus according to an embodiment.

Referring to FIG. 12, a wireless communication system may include afirst device (100 a) and a second device (100 b).

The first device (100 a) is a base station, a network node, atransmitting terminal, a receiving terminal, a wireless device, awireless communication device, a vehicle, a vehicle equipped with anautonomous driving function, a connected car, a drone (Unmanned AerialVehicle, UAV), Artificial Intelligence (AI) Module, Robot, AR (AugmentedReality) Device, VR (Virtual Reality) Device, MR (Mixed Reality) Device,Hologram Device, Public Safety Device, MTC Device, IoT Device, MedicalDevice, Fin tech device (or financial device), a security device, aclimate/environment device, a device related to 5G services, or otherdevices related to the 4th industrial revolution field.

The second device (100 b) is a base station, a network node, atransmitting terminal, a receiving terminal, a wireless device, awireless communication device, a vehicle, a vehicle equipped with anautonomous driving function, a connected car, a drone (Unmanned AerialVehicle, UAV), Artificial Intelligence (AI) Module, Robot, AR (AugmentedReality) Device, VR (Virtual Reality) Device, MR (Mixed Reality) Device,Hologram Device, Public Safety Device, MTC Device, IoT Device, MedicalDevice, Fin tech device (or financial device), a security device, aclimate/environment device, a device related to 5G services, or otherdevices related to the 4th industrial revolution field.

The first device (100 a) includes at least one processor, such as aprocessor (1020 a), and at least one memory, such as a memory (1010 a),it may include at least one transceiver, such as transceiver (1031 a).The processor (1020 a) may perform the functions, procedures, and/ormethods described above. The processor (1020 a) may perform one or moreprotocols. For example, the processor (1020 a) may perform one or morelayers of an air interface protocol. The memory (1010 a) is connected tothe processor (1020 a) and may store various types of information and/orcommands. The transceiver (1031 a) may be connected to the processor(1020 a) and may be controlled to transmit/receive a wireless signal.

The second device (100 b) may include at least one processor such as aprocessor (1020 b), at least one memory device such as a memory (1010b), and at least one transceiver such as a transceiver (1031 b). Theprocessor (1020 b) may perform the functions, procedures, and/or methodsdescribed above. The processor (1020 b) may implement one or moreprotocols. For example, the processor (1020 b) may implement one or morelayers of an air interface protocol. The memory (1010 b) is connected tothe processor (1020 b) and may store various types of information and/orcommands. The transceiver (1031 b) may be connected to the processor(1020 b) and may be controlled to transmit/receive a wireless signal.

The memory (1010 a) and/or the memory (1010 b) may be respectivelyconnected inside or outside the processor (1020 a) and/or the processor(1020 b), and may be connected to other processors through varioustechnologies such as wired or wireless connection.

The first device (100 a) and/or the second device (100 b) may have oneor more antennas. For example, antenna (1036 a) and/or antenna (1036 b)may be configured to transmit and receive wireless signals.

FIG. 13 is a block diagram illustrating the configuration of a terminalaccording to an embodiment.

In particular, FIG. 13 is a diagram illustrating the apparatus of FIG.12 in more detail above.

The device includes a memory (1010), a processor (1020), a transceiver(1031), a power management module (1091), a battery (1092), a display(1041), an input unit (1053), a speaker (1042) and a microphone (1052),SIM (subscriber identification module) card, and one or more antennas.

The processor (1020) may be configured to implement the proposedfunctions, procedures and/or methods described herein. The layers of theair interface protocol may be implemented in the processor (1020). Theprocessor (1020) may include an application-specific integrated circuit(ASIC), other chipsets, logic circuits, and/or data processing devices.The processor (1020) may be an AP (application processor). The processor(1020) may include at least one of a DSP (digital signal processor), aCPU (central processing unit), a GPU (graphics processing unit), and amodem (modulator and demodulator). Examples of processor (1020) includeSNAPDRAGON™ series processors manufactured by Qualcomm®, EXYNOS™ seriesprocessors manufactured by Samsung®, A series processors manufactured byApple®, HELIO™ series processors manufactured by MediaTek®, ATOM™ seriesprocessor manufactured by INTEL® or a corresponding next-generationprocessor.

The power management module (1091) manages power for the processor(1020) and/or the transceiver (1031). The battery (1092) supplies powerto the power management module (1091). The display (1041) outputs theresult processed by the processor (1020). Input (1053) receives input tobe used by processor (1020). The input unit (1053) may be displayed onthe display (1041). A SIM card is an integrated circuit used to securelystore an IMSI (international mobile subscriber identity) and associatedkeys used to identify and authenticate subscribers in mobile phonedevices such as mobile phones and computers. Many SIM cards can alsostore contact information.

The memory (1010) is operatively coupled to the processor (1020), andstores various information for operating the processor (610). Memory(1010) may include ROM (read-only memory), RAM (random access memory),flash memory, memory cards, storage media, and/or other storage devices.When the embodiment is implemented in software, the techniques describedin this specification may be implemented in modules (eg, procedures,functions, etc.) that perform the functions described in thisspecification. Modules may be stored in memory (1010) and executed byprocessor (1020). The memory (1010) may be implemented inside theprocessor (1020). Alternatively, the memory (1010) may be implementedoutside the processor (1020), and may be communicatively connected tothe processor (1020) through various means known in the art.

The transceiver (1031) is operatively coupled to the processor (1020)and transmits and/or receives a radio signal. The transceiver (1031)includes a transmitter and a receiver. The transceiver (1031) mayinclude a baseband circuit for processing a radio frequency signal. Thetransceiver controls one or more antennas to transmit and/or receiveradio signals. The processor (1020) transmits command information to thetransceiver (1031) to transmit, for example, a radio signal constitutingvoice communication data to initiate communication. The antennafunctions to transmit and receive radio signals. When receiving awireless signal, the transceiver (1031) may transmit the signal forprocessing by the processor (1020) and convert the signal to a baseband.The processed signal may be converted into audible or readableinformation output through the speaker (1042).

The speaker (1042) outputs sound related results processed by theprocessor (1020). Microphone (1052) receives sound related input to beused by processor (1020).

The user inputs command information such as a phone number by, forexample, pressing (or touching) a button of the input unit (1053) orvoice activation using the microphone (1052). The processor (1020)receives such command information and processes it to perform anappropriate function, such as making a call to a phone number.Operational data may be extracted from the SIM card or the memory(1010). In addition, the processor (1020) may display commandinformation or display information on the display (1041) for the user torecognize and for convenience.

FIG. 14 shows a block diagram of a processor in which the disclosure ofthe present specification is implemented.

As can be seen with reference to FIG. 14, in order that the proposedfunctions, procedures and/or methods described in the disclosure of thisspecification is implemented, a processor (1020) may include a pluralityof circuitry. For example, the processor (1020) may include a firstcircuit (1020-1), a second circuit (1020-2), and a third circuit(1020-3). Also, although not shown, the processor (1020) may includemore circuits. Each circuit may include a plurality of transistors.

The processor (1020) may be referred to as an ASIC (application-specificintegrated circuit) or an AP (application processor), and may include atleast one of a DSP (digital signal processor), a CPU (central processingunit), and a GPU (graphics processing unit).

The first circuit (1020-1) may receive a capability inquiry message fromthe base station.

The second circuit (1020-2) may transmit capability information to thebase station. The capability information may include information onwhether to support a radio link with the base station and a sidelinkwith a neighboring V2X device through the same antenna.

The third circuit (1020-3) may receive information on a default beamconfigured based on the capability information from the base station.

The information on the default beam may include: information in which abeam for sidelink is set as a default beam.

The information on the default beam may include: information for a beamfor sidelink.

The default beam may be set to a level that satisfies: sphericalcoverage EIRP (effective isotropic radiated power) for a radio link withthe base station.

If the spherical coverage for the radio link with the base stationincludes 90 degrees or −90 degrees with respect to the vertical axis ofthe vehicle, the default beam is set to 90 degrees or −90 degrees withrespect to the vertical axis forward or backward. can

The sidelink may be operated in the FR2 band.

Beam forming may be used for the sidelink, but beam management may notbe used.

FIG. 15 is a detailed block diagram illustrating the transceiver of thefirst device shown in FIG. 12 or the transceiver of the device shown inFIG. 13 in detail.

Referring to FIG. 15, the transceiver (1031) includes a transmitter(1031-1) and a receiver (1031-2). The transmitter (1031-1) includes aDiscrete Fourier Transform (DFT) unit (1031-11), a subcarrier mapper(1031-12), an IFFT unit (1031-13) and a CP insertion unit (1031-14), anda wireless transmitter (1031-15). The transmitter (1031-1) may furtherinclude a modulator. In addition, for example, a scramble unit (notshown; scramble unit), a modulation mapper (not shown; modulationmapper), a layer mapper (not shown; layer mapper) and a layer permutator(not shown; layer permutator) may be further included, this may bedisposed before the DFT unit (1031-11). That is, in order to prevent anincrease in PAPR (peak-to-average power ratio), the transmitter (1031-1)passes information through the DFT (1031-11) before mapping a signal toa subcarrier. After subcarrier mapping is performed on the signal spread(or precoded in the same sense) by the DFT unit (1031-11) through thesubcarrier mapper (1031-12), an IFFT (Inverse Fast Fourier Transform)unit (1031-13) to make it a signal on the time axis.

The DFT unit (1031-11) outputs complex-valued symbols by performing DFTon input symbols. For example, when Ntx symbols are input (however, Ntxis a natural number), the DFT size is Ntx. The DFT unit (1031-11) may becalled a transform precoder. The subcarrier mapper (1031-12) maps thecomplex symbols to each subcarrier in the frequency domain. The complexsymbols may be mapped to resource elements corresponding to resourceblocks allocated for data transmission. The subcarrier mapper (1031-12)may be referred to as a resource element mapper. The IFFT unit (1031-13)outputs a baseband signal for data that is a time domain signal byperforming IFFT on an input symbol. The CP insertion unit (1031-14)copies a part of the rear part of the base band signal for data andinserts it into the front part of the base band signal for data. ISI(Inter-symbol interference) and ICI (Inter-Carrier Interference) areprevented through CP insertion, so that orthogonality can be maintainedeven in a multi-path channel.

On the other hand, the receiver (1031-2) includes a radio receiver(1031-21), a CP remover (1031-22), an FFT unit (1031-23), and anequalizer (1031-24). The radio receiving unit (1031-21), the CP removingunit (1031-22), and the FFT unit (1031-23) of the receiver (1031-2)include the radio transmitting unit (1031-15) in the transmitting end(1031-1), It performs the reverse function of the CP insertion unit(1031-14) and the IFF unit (1031-13). The receiver (1031-2) may furtherinclude a demodulator.

V. Examples to which the Disclosure of the Present Specification can beApplied

Although not limited thereto, the various descriptions, functions,procedures, suggestions, methods, and/or flow charts of the disclosureof the present specification disclosed may be applied in various fieldsrequiring wireless communication/connection (e.g., 5G) between devices.

Hereinafter, it will be exemplified in more detail with reference to thedrawings. In the following drawings/descriptions, the same referencenumerals may represent the same or corresponding hardware blocks,software blocks, or functional blocks, unless otherwise indicated.

FIG. 16 illustrates a communication system 1 applied to the disclosureof the present specification.

Referring to FIG. 16, a communication system (1) applied to thedisclosure of the present specification includes a wireless device, abase station, and a network. Here, the wireless device may mean a devicethat performs communication using a wireless access technology (e.g., 5GNR (New RAT), LTE (Long Term Evolution)), and may be referred to as acommunication/wireless/5G device. Although not limited thereto, thewireless device may include a robot (100 a), a vehicle (100 b-1, 100b-2), an XR (eXtended Reality) device (100 c), a hand-held device (100d, and a home appliance (100 e), an IoT (Internet of Thing) device (100f), and an AI device/server (400). For example, the vehicle may includea vehicle equipped with a wireless communication function, an autonomousdriving vehicle, a vehicle capable of performing inter-vehiclecommunication, and the like. Here, the vehicle may include an UAV(Unmanned Aerial Vehicle) (e.g., a drone). XR devices include AR(Augmented Reality)/VR (Virtual Reality)/MR (Mixed Reality) devices, andinclude a HMD (Head-Mounted Device), a HUD (Head-Up Display) provided ina vehicle, a television, a smartphone, It may be implemented in the formof a computer, a wearable device, a home appliance, a digital signage, avehicle, a robot, and the like. The portable device may include a smartphone, a smart pad, a wearable device (eg, a smart watch, smartglasses), a computer (e.g., a laptop computer), and the like. Homeappliances may include a TV, a refrigerator, a washing machine, and thelike. The IoT device may include a sensor, a smart meter, and the like.For example, the base station and the network may be implemented as awireless device, and the specific wireless device (200 a) may operate asa base station/network node to other wireless devices.

The wireless devices (100 a-100 f) may be connected to the network (300)through the base station (200). AI (Artificial Intelligence) technologymay be applied to the wireless devices (100 a-100 f), and the wirelessdevices (100 a-100 f) may be connected to the AI server (400) throughthe network (300). The network (300) may be configured using a 3Gnetwork, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Thewireless devices (100 a-100 f) may communicate with each other throughthe base station (200)/network (300), but may also communicate directly(e.g. sidelink communication) without passing through the basestation/network. For example, the vehicles (100 b-1, 100 b-2) mayperform direct communication (e.g. Vehicle to Vehicle (V2V)/Vehicle toeverything (V2X) communication). In addition, the IoT device (e.g.,sensor) may directly communicate with other IoT devices (e.g., sensor)or other wireless devices (100 a-100 f).

Wireless communication/connection (150 a, 150 b, and 150 c) may beperformed between the wireless devices (100 a-100 f)/base station (200)and the base station (200)/base station (200). Here, the wirelesscommunication/connection includes uplink/downlink communication (150 a)and sidelink communication (150 b) (or D2D communication), andcommunication between base stations (150 c) (e.g. relay, IAB (IntegratedAccess Backhaul)). This can be done through technology (e.g. 5G NR)Wireless communication/connection (150 a, 150 b, 150 c) allows thewireless device and the base station/radio device, and the base stationand the base station to transmit/receive wireless signals to each other.For example, the wireless communication/connection (150 a, 150 b, and150 c) may transmit/receive a signal through various physical channels.To this end, based on various proposals of the present specification, Atleast some of various configuration information setting process fortransmission/reception of a wireless signal (e.g., channelencoding/decoding, modulation/demodulation, resource mapping/demapping,etc.), resource allocation process and etc. may be performed.

In the above, preferred embodiments have been exemplarily described, butthe disclosure of the present specification is not limited to suchspecific embodiments, and thus, modifications, changes, or can beimproved.

In the exemplary system described above, the methods are described onthe basis of a flowchart as a series of steps or blocks, but are notlimited to the order of the steps described, some steps may occur in adifferent order or concurrent with other steps as described above. have.In addition, those skilled in the art will understand that the stepsshown in the flowchart are not exclusive and that other steps may beincluded or that one or more steps of the flowchart may be deletedwithout affecting the scope of rights.

The claims described herein may be combined in various ways. Forexample, the technical features of the method claims of the presentspecification may be combined and implemented as an apparatus, and thetechnical features of the apparatus claims of the present specificationmay be combined and implemented as a method. In addition, the technicalfeatures of the method claim of the present specification and thetechnical features of the apparatus claim may be combined to beimplemented as an apparatus, and the technical features of the methodclaim of the present specification and the technical features of theapparatus claim may be combined and implemented as a method.

What is claimed is:
 1. A method of operating for V2X(VEHICLE-TO-EVERYTHING) device equipped on a vehicle, comprising:receiving capability Enquiry message from base station; transmittingcapability information to the base station; wherein the capabilityinformation includes information on whether the V2X device supports bothradio link with the base station and sidelink with neighbor V2X deviceby the same antenna, receiving, from the base station, information ondefault beam which is configured based on the capability information. 2.The method of claim 1, wherein the information on default beam includesinformation configuring a beam for sidelink as default beam.
 3. Themethod of claim 1, Wherein the information on default beam includesinformation for a beam for sidelink.
 4. The method of claim 1, whereinthe default beam is determined by a level that satisfies a sphericalcoverage EIRP (effective isotropic radiated power) for a radio link withthe base station.
 5. The method of claim 1, wherein the default beam isset to a beam of 90 degrees or −90 degrees with respect to the verticalaxis to the front or rear Way, based on that the spherical coverage forthe radio link with the base station includes 90 degrees or −90 degreeswith respect to the vertical axis of the vehicle.
 6. The method of claim1, wherein the sidelink is operated in FR2 band.
 7. The method of claim6, wherein beamforming is used for the sidelink, but beam management forthe sidelink is not used.
 8. A V2X (VEHICLE-TO-EVERYTHING) deviceequipped on a vehicle comprising: at least one processor; and at leastone memory for storing instructions and operably electricallyconnectable with the at least one processor, based on the instructionsbeing operated by the at least one processor, performed operationcomprising: receiving capability Enquiry message from base station;transmitting capability information to the base station; wherein thecapability information includes information on whether the V2X devicesupports both radio link with the base station and sidelink withneighbor V2X device by the same antenna, receiving, from the basestation, information on default beam which is configured based on thecapability information.
 9. The device of claim 8, wherein theinformation on default beam includes information configuring a beam forsidelink as default beam.
 10. The device of claim 8, Wherein theinformation on default beam includes information for a beam forsidelink.
 11. The device of claim 8, wherein the default beam isdetermined by a level that satisfies a spherical coverage EIRP(effective isotropic radiated power) for a radio link with the basestation.
 12. The device of claim 8, wherein the default beam is set to abeam of 90 degrees or −90 degrees with respect to the vertical axis tothe front or rear Way, based on that the spherical coverage for theradio link with the base station includes 90 degrees or −90 degrees withrespect to the vertical axis of the vehicle.
 13. A non-volatile computerreadable storage medium having recorded instructions, wherein theinstructions, based on being executed by one or more processors, causethe one or more processors to: receive capability Enquiry message frombase station; transmit capability information to the base station;wherein the capability information includes information on whether theV2X device supports both radio link with the base station and sidelinkwith neighbor V2X device by the same antenna, receive, from the basestation, information on default beam which is configured based on thecapability information.